﻿using Grand.Business.Core.Extensions;
using Grand.Business.Core.Interfaces.Authentication;
using Grand.Business.Core.Interfaces.Common.Directory;
using Grand.Business.Core.Interfaces.Common.Localization;
using Grand.Business.Core.Interfaces.Marketing.Newsletters;
using Grand.Domain.Common;
using Grand.Domain.Customers;
using Grand.Domain.Tax;
using Grand.Web.Common.Localization;
using Grand.Web.Features.Models.Customers;
using Grand.Web.Models.Customer;
using Grand.Web.Models.Newsletter;
using MediatR;
using Microsoft.AspNetCore.Mvc.Rendering;

namespace Grand.Web.Features.Handlers.Customers;

public class GetInfoHandler : IRequestHandler<GetInfo, CustomerInfoModel>
{
    private readonly ICountryService _countryService;
    private readonly CustomerSettings _customerSettings;
    private readonly IExternalAuthenticationService _externalAuthenticationService;
    private readonly IMediator _mediator;
    private readonly INewsletterCategoryService _newsletterCategoryService;
    private readonly INewsLetterSubscriptionService _newsLetterSubscriptionService;
    private readonly TaxSettings _taxSettings;
    private readonly ITranslationService _translationService;
    private readonly IEnumTranslationService _enumTranslationService;
    
    public GetInfoHandler(
        INewsLetterSubscriptionService newsLetterSubscriptionService,
        INewsletterCategoryService newsletterCategoryService,
        ITranslationService translationService,
        ICountryService countryService,
        IExternalAuthenticationService externalAuthenticationService,
        IMediator mediator,
        CustomerSettings customerSettings,
        TaxSettings taxSettings, 
        IEnumTranslationService enumTranslationService)
    {
        _newsLetterSubscriptionService = newsLetterSubscriptionService;
        _newsletterCategoryService = newsletterCategoryService;
        _translationService = translationService;
        _countryService = countryService;
        _externalAuthenticationService = externalAuthenticationService;
        _mediator = mediator;
        _customerSettings = customerSettings;
        _taxSettings = taxSettings;
        _enumTranslationService = enumTranslationService;
    }

    public async Task<CustomerInfoModel> Handle(GetInfo request, CancellationToken cancellationToken)
    {
        var model = new CustomerInfoModel();
        if (request.Model != null)
            model = request.Model;

        if (!request.ExcludeProperties)
        {
            PrepareNotExludeModel(model, request);
        }
        else
        {
            if (_customerSettings.UsernamesEnabled && !_customerSettings.AllowUsersToChangeUsernames)
                model.Username = request.Customer.Username;
        }

        //newsletter
        await PrepareNewsletter(model, request);

        //settings
        await PrepareModelSettings(model, request);

        //external authentication
        await PrepareExternalAuth(model, request);

        //custom customer attributes
        var customAttributes = await _mediator.Send(new GetCustomAttributes {
            Customer = request.Customer,
            Language = request.Language,
            OverrideAttributes = request.OverrideCustomCustomerAttributes
        }, cancellationToken);
        foreach (var attribute in customAttributes)
            model.CustomerAttributes.Add(attribute);

        return model;
    }

    private void PrepareNotExludeModel(CustomerInfoModel model, GetInfo request)
    {
        model.VatNumber = request.Customer.GetUserFieldFromEntity<string>(SystemCustomerFieldNames.VatNumber);
        model.FirstName = request.Customer.GetUserFieldFromEntity<string>(SystemCustomerFieldNames.FirstName);
        model.LastName = request.Customer.GetUserFieldFromEntity<string>(SystemCustomerFieldNames.LastName);
        model.Gender = request.Customer.GetUserFieldFromEntity<string>(SystemCustomerFieldNames.Gender);
        var dateOfBirth = request.Customer.GetUserFieldFromEntity<DateTime?>(SystemCustomerFieldNames.DateOfBirth);
        if (dateOfBirth.HasValue)
        {
            model.DateOfBirthDay = dateOfBirth.Value.Day;
            model.DateOfBirthMonth = dateOfBirth.Value.Month;
            model.DateOfBirthYear = dateOfBirth.Value.Year;
        }

        model.Company = request.Customer.GetUserFieldFromEntity<string>(SystemCustomerFieldNames.Company);
        model.StreetAddress = request.Customer.GetUserFieldFromEntity<string>(SystemCustomerFieldNames.StreetAddress);
        model.StreetAddress2 = request.Customer.GetUserFieldFromEntity<string>(SystemCustomerFieldNames.StreetAddress2);
        model.ZipPostalCode = request.Customer.GetUserFieldFromEntity<string>(SystemCustomerFieldNames.ZipPostalCode);
        model.City = request.Customer.GetUserFieldFromEntity<string>(SystemCustomerFieldNames.City);
        model.CountryId = request.Customer.GetUserFieldFromEntity<string>(SystemCustomerFieldNames.CountryId);
        model.StateProvinceId =
            request.Customer.GetUserFieldFromEntity<string>(SystemCustomerFieldNames.StateProvinceId);
        model.Phone = request.Customer.GetUserFieldFromEntity<string>(SystemCustomerFieldNames.Phone);
        model.Fax = request.Customer.GetUserFieldFromEntity<string>(SystemCustomerFieldNames.Fax);
        model.Email = request.Customer.Email;
        model.Username = request.Customer.Username;
    }

    private async Task PrepareNewsletter(CustomerInfoModel model, GetInfo request)
    {
        //newsletter
        var newsletter =
            await _newsLetterSubscriptionService.GetNewsLetterSubscriptionByEmailAndStoreId(request.Customer.Email,
                request.Store.Id);
        //TODO - it is necessary ?
        //if (newsletter == null)
        //    newsletter = await _newsLetterSubscriptionService.GetNewsLetterSubscriptionByCustomerId(request.Customer.Id);

        model.Newsletter = newsletter is { Active: true };

        var categories = (await _newsletterCategoryService.GetAllNewsletterCategory()).ToList();
        categories.ForEach(x => model.NewsletterCategories.Add(new NewsletterSimpleCategory {
            Id = x.Id,
            Description = x.GetTranslation(y => y.Description, request.Language.Id),
            Name = x.GetTranslation(y => y.Name, request.Language.Id),
            Selected = newsletter != null && newsletter.Categories.Contains(x.Id)
        }));
    }

    private async Task PrepareModelSettings(CustomerInfoModel model, GetInfo request)
    {
        //countries and states
        if (_customerSettings.CountryEnabled)
        {
            model.AvailableCountries.Add(new SelectListItem
                { Text = _translationService.GetResource("Address.SelectCountry"), Value = "" });
            foreach (var c in await _countryService.GetAllCountries(request.Language.Id, request.Store.Id))
                model.AvailableCountries.Add(new SelectListItem {
                    Text = c.GetTranslation(x => x.Name, request.Language.Id),
                    Value = c.Id,
                    Selected = c.Id == model.CountryId
                });

            if (_customerSettings.StateProvinceEnabled)
            {
                //states
                var states = await _countryService.GetStateProvincesByCountryId(model.CountryId, request.Language.Id);
                model.AvailableStates.Add(new SelectListItem
                    { Text = _translationService.GetResource("Address.SelectState"), Value = "" });

                foreach (var s in states)
                    model.AvailableStates.Add(new SelectListItem {
                        Text = s.GetTranslation(x => x.Name, request.Language.Id), Value = s.Id,
                        Selected = s.Id == model.StateProvinceId
                    });
            }
        }

        model.DisplayVatNumber = _taxSettings.EuVatEnabled;
        model.VatNumberStatusNote = _enumTranslationService.GetTranslationEnum((VatNumberStatus)request.Customer.GetUserFieldFromEntity<int>(SystemCustomerFieldNames.VatNumberStatusId));
        model.GenderEnabled = _customerSettings.GenderEnabled;
        model.DateOfBirthEnabled = _customerSettings.DateOfBirthEnabled;
        model.DateOfBirthRequired = _customerSettings.DateOfBirthRequired;
        model.FirstLastNameRequired = _customerSettings.FirstLastNameRequired;
        model.CompanyEnabled = _customerSettings.CompanyEnabled;
        model.CompanyRequired = _customerSettings.CompanyRequired;
        model.StreetAddressEnabled = _customerSettings.StreetAddressEnabled;
        model.StreetAddressRequired = _customerSettings.StreetAddressRequired;
        model.StreetAddress2Enabled = _customerSettings.StreetAddress2Enabled;
        model.StreetAddress2Required = _customerSettings.StreetAddress2Required;
        model.ZipPostalCodeEnabled = _customerSettings.ZipPostalCodeEnabled;
        model.ZipPostalCodeRequired = _customerSettings.ZipPostalCodeRequired;
        model.CityEnabled = _customerSettings.CityEnabled;
        model.CityRequired = _customerSettings.CityRequired;
        model.CountryEnabled = _customerSettings.CountryEnabled;
        model.CountryRequired = _customerSettings.CountryRequired;
        model.StateProvinceEnabled = _customerSettings.StateProvinceEnabled;
        model.StateProvinceRequired = _customerSettings.StateProvinceRequired;
        model.PhoneEnabled = _customerSettings.PhoneEnabled;
        model.PhoneRequired = _customerSettings.PhoneRequired;
        model.FaxEnabled = _customerSettings.FaxEnabled;
        model.FaxRequired = _customerSettings.FaxRequired;
        model.NewsletterEnabled = _customerSettings.NewsletterEnabled;
        model.UsernamesEnabled = _customerSettings.UsernamesEnabled;
        model.AllowUsersToChangeUsernames = _customerSettings.AllowUsersToChangeUsernames;
        model.AllowUsersToChangeEmail = _customerSettings.AllowUsersToChangeEmail;
        model.CheckUsernameAvailabilityEnabled = _customerSettings.CheckUsernameAvailabilityEnabled;
        model.Is2faEnabled = request.Customer.GetUserFieldFromEntity<bool>(SystemCustomerFieldNames.TwoFactorEnabled);
    }

    private async Task PrepareExternalAuth(CustomerInfoModel model, GetInfo request)
    {
        model.NumberOfExternalAuthenticationProviders = _externalAuthenticationService
            .LoadActiveAuthenticationProviders(request.Customer, request.Store).Count;
        foreach (var ear in await _externalAuthenticationService.GetExternalIdentifiers(request.Customer))
        {
            if (!_externalAuthenticationService.AuthenticationProviderIsAvailable(ear.ProviderSystemName))
                continue;

            var authMethod =
                _externalAuthenticationService.LoadAuthenticationProviderBySystemName(ear.ProviderSystemName);

            model.AssociatedExternalAuthRecords.Add(new CustomerInfoModel.AssociatedExternalAuthModel {
                Id = ear.Id,
                Email = ear.Email,
                ExternalIdentifier = ear.ExternalDisplayIdentifier,
                AuthMethodName = authMethod.FriendlyName
            });
        }
    }
}